Mountain bike stem



FIG. 1 is a front and right side perspective view of a mountain bike stem showing my new design;

FIG. 2 is a rear and left side perspective view thereof;

FIG. 3 is a right side elevational view thereof. The left side is a mirror image of the right side;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a front elevational view thereof;

FIG. 7 is a rear elevational view thereof;

FIG. 8 is a front and right side perpsective view of a mountain bike stem showing a second embodiment of my new design;

FIG. 9 is a rear and left side perspective view of FIG. 8;

FIG. 10 is a right side elevational view of FIG. 8, the left side being a mirror image of that side shown in FIG. 8;

FIG. 11 is a top plan view of FIG. 8;

FIG. 12 is a bottom plan view of FIG. 8;

FIG. 13 is a front elevational view of FIG. 8; and,

FIG. 14 is a rear elevational view of FIG. 8. 

The ornamental design for a mountain bike stem, as shown and described. 